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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in LL21 (Denbighshire)

See if solar pays off for you in Denbighshire — price, savings and payback in under a minute (official UK data).

Solar Calculator

Change the settings below to see how costs and savings work for your situation.

System Size

Roof Direction

Battery Storage

Export Value

Your Numbers

Break-even
15.2 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£804
What you save every year
Profit Over 25 Years
£7,904
After paying itself off, you're this much ahead

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How we calculate this

Solar generation: Based on typical south-facing roof at 35° angle. We account for weather, dirt, and system losses (14%).

How much you'll use directly:

  • Without battery: You'll use about 40% of what you generate. The rest gets sold back to the grid.
  • With 5 kWh battery: You'll use about 70% (battery stores extra for evening use).
  • With 10 kWh battery: You'll use about 75% (more storage means less exported).
  • Panel-only payback: Bigger systems don’t shorten payback—cost and savings rise together per kW.
  • Battery & payback: Batteries raise self-use and cut bills, but added hardware cost often lengthens break-even at typical UK rates.
  • When a battery can still make sense:
    • Evening-heavy usage patterns
    • Time-of-use tariffs / cheap night rates
    • Low export rate vs. high unit rate
    • Heat pump or EV charging synergy
    • Optional backup/resilience (system-dependent)
    • Lower evening-hour CO₂ vs. grid

Costs: Battery prices are typically £700 per kWh. Export tariffs vary by supplier (usually 5–15p per kWh).

Grid connection: Systems up to about 3.7 kW typically need just a notification (G98). Larger systems may need permission (G99).

These are typical values based on average usage patterns. Your actual results will vary based on your roof, shading, and how you use electricity.

Your area in context

In North Wales and Mersey, the current unit rate is 27.72p/kWh with a 69.95p/day standing charge. Your postcode’s south-facing sunshine yield is 785 kWh/kW — 145 below the regional median (930).

Read the full story

A typical roof here lands around 6.0 kW, with most eligible homes comfortably fitting within 3–6 kW. Each kilowatt of panels produces roughly 785 kWh per year on a south-facing roof. We value self-used electricity at 27.7p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
27.7p/kWh
Standing charge
70.0p/day
Sunshine yield (south)
785 kWh/kW
Export price (baseline)
10p/kWh

Browse the scenarios below. Each battery size has its own expand — open the one that matches your plan (or just explore). For each system size (2–8 kW) we show annual output, how much you use directly, what gets exported, annual benefit, upfront cost, break-even, and a 20-year net. Negative numbers are possible — that’s the honest trade-off when adding more battery than your usage profile justifies.

No battery 5 kW example → Annual benefit: £670, Upfront: £10,173, Break-even: 15.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1569 kWh 628 kWh 942 kWh £174 £94 £268 £4,069 15.2 yrs £1,294
3 kW 2354 kWh 942 kWh 1412 kWh £261 £141 £402 £6,104 15.2 yrs £1,941
4 kW 3138 kWh 1255 kWh 1883 kWh £348 £188 £536 £8,138 15.2 yrs £2,588
5 kW 3923 kWh 1569 kWh 2354 kWh £435 £235 £670 £10,173 15.2 yrs £3,235
6 kW 4708 kWh 1883 kWh 2825 kWh £522 £282 £804 £12,207 15.2 yrs £3,882
7 kW 5492 kWh 2197 kWh 3295 kWh £609 £330 £939 £14,242 15.2 yrs £4,529
8 kW 6277 kWh 2511 kWh 3766 kWh £696 £377 £1,073 £16,276 15.2 yrs £5,176

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

3 kWh battery 5 kW example → Annual benefit: £809, Upfront: £12,273, Break-even: 15.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1569 kWh 942 kWh 628 kWh £261 £63 £324 £6,169 19.1 yrs £306
3 kW 2354 kWh 1412 kWh 942 kWh £391 £94 £486 £8,204 16.9 yrs £1,509
4 kW 3138 kWh 1883 kWh 1255 kWh £522 £126 £648 £10,238 15.8 yrs £2,712
5 kW 3923 kWh 2354 kWh 1569 kWh £652 £157 £809 £12,273 15.2 yrs £3,915
6 kW 4708 kWh 2825 kWh 1883 kWh £783 £188 £971 £14,307 14.7 yrs £5,118
7 kW 5492 kWh 3295 kWh 2197 kWh £913 £220 £1,133 £16,342 14.4 yrs £6,321
8 kW 6277 kWh 3766 kWh 2511 kWh £1,044 £251 £1,295 £18,376 14.2 yrs £7,525

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

5 kWh battery 5 kW example → Annual benefit: £879, Upfront: £13,673, Break-even: 15.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1569 kWh 1098 kWh 471 kWh £304 £47 £352 £7,569 21.5 yrs £-538
3 kW 2354 kWh 1648 kWh 706 kWh £457 £71 £527 £9,604 18.2 yrs £943
4 kW 3138 kWh 2197 kWh 942 kWh £609 £94 £703 £11,638 16.6 yrs £2,425
5 kW 3923 kWh 2746 kWh 1177 kWh £761 £118 £879 £13,673 15.6 yrs £3,906
6 kW 4708 kWh 3295 kWh 1412 kWh £913 £141 £1,055 £15,707 14.9 yrs £5,387
7 kW 5492 kWh 3845 kWh 1648 kWh £1,066 £165 £1,230 £17,742 14.4 yrs £6,868
8 kW 6277 kWh 4394 kWh 1883 kWh £1,218 £188 £1,406 £19,776 14.1 yrs £8,349

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

7.5 kWh battery 5 kW example → Annual benefit: £900, Upfront: £15,423, Break-even: 17.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1569 kWh 1146 kWh 424 kWh £318 £42 £360 £9,319 25.9 yrs £-2,121
3 kW 2354 kWh 1718 kWh 636 kWh £476 £64 £540 £11,354 21.0 yrs £-556
4 kW 3138 kWh 2291 kWh 847 kWh £635 £85 £720 £13,388 18.6 yrs £1,008
5 kW 3923 kWh 2864 kWh 1059 kWh £794 £106 £900 £15,423 17.1 yrs £2,573
6 kW 4708 kWh 3437 kWh 1271 kWh £953 £127 £1,080 £17,457 16.2 yrs £4,137
7 kW 5492 kWh 4009 kWh 1483 kWh £1,111 £148 £1,260 £19,492 15.5 yrs £5,702
8 kW 6277 kWh 4582 kWh 1695 kWh £1,270 £169 £1,440 £21,526 15.0 yrs £7,266

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

10 kWh battery 5 kW example → Annual benefit: £914, Upfront: £17,173, Break-even: 18.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1569 kWh 1177 kWh 392 kWh £326 £39 £365 £11,069 30.3 yrs £-3,760
3 kW 2354 kWh 1765 kWh 588 kWh £489 £59 £548 £13,104 23.9 yrs £-2,140
4 kW 3138 kWh 2354 kWh 785 kWh £652 £78 £731 £15,138 20.7 yrs £-519
5 kW 3923 kWh 2942 kWh 981 kWh £816 £98 £914 £17,173 18.8 yrs £1,101
6 kW 4708 kWh 3531 kWh 1177 kWh £979 £118 £1,096 £19,207 17.5 yrs £2,721
7 kW 5492 kWh 4119 kWh 1373 kWh £1,142 £137 £1,279 £21,242 16.6 yrs £4,341
8 kW 6277 kWh 4708 kWh 1569 kWh £1,305 £157 £1,462 £23,276 15.9 yrs £5,961

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

13.5 kWh battery 5 kW example → Annual benefit: £928, Upfront: £19,623, Break-even: 21.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1569 kWh 1208 kWh 361 kWh £335 £36 £371 £13,519 36.4 yrs £-6,098
3 kW 2354 kWh 1812 kWh 541 kWh £502 £54 £557 £15,554 27.9 yrs £-4,423
4 kW 3138 kWh 2417 kWh 722 kWh £670 £72 £742 £17,588 23.7 yrs £-2,747
5 kW 3923 kWh 3021 kWh 902 kWh £837 £90 £928 £19,623 21.2 yrs £-1,071
6 kW 4708 kWh 3625 kWh 1083 kWh £1,005 £108 £1,113 £21,657 19.5 yrs £605
7 kW 5492 kWh 4229 kWh 1263 kWh £1,172 £126 £1,299 £23,692 18.2 yrs £2,280
8 kW 6277 kWh 4833 kWh 1444 kWh £1,340 £144 £1,484 £25,726 17.3 yrs £3,956

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

Figures are illustrative and use the same method as the calculator above. For exact results, adjust your roof direction, tariff, and usage in the calculator.

Insights for LL21

Figures below are tailored to LL21 — click through for full league tables.

Big-Roof Britain Rank #308 of 2182
5.9 kWp (UK avg 5.1 kWp)
~12 panels (≈430 W)
Solar Payback Index Rank #2853 of 2997
13.1 years (UK avg 11.3 years)
~£930 /yr • £12,207 upfront
Standing-Charge Drag Rank #2460 of 2997
27.5% (UK avg 21.7%) drag on savings
£255 fixed • ~£930 /yr value

Your Area at a Glance

Your Electricity Rate
27.72p/kWh
Daily Fixed Charge
69.95p/day
Local Sunshine
785kWh/kW
A 1 kW system generates ~785 kWh per year. A typical home uses ~2,700 kWh per year.
Typical System Size
6.0kW
For houses & bungalows in this area

Local Property Data

Property Types

Houses: 73% • Flats: 3% • Bungalows: 23% Based on 1,791 properties

Coverage

Denbighshire (78%)|Conwy (19%)|Gwynedd (3%)

Areas Covered

Edeirnion, Uwch Aled, Llanfair Dyffryn Clwyd Gwyddelwern, Efenechdyd, Llandderfel

Data Sources & Assumptions

Solar yield: PVGIS (EU Joint Research Centre), January 2025 data

Electricity rates: Ofgem price cap, Q4 2025

Installation costs: MCS certified installer data, March 2025

Property data: EPC open data (Open Government Licence), aggregated

All estimates are typical values. Actual results vary based on your specific situation, roof characteristics, and usage patterns.

Compare nearby areas

Nearby in North Wales and Mersey

LL20 (Denbighshire)
≈14.5 km away
Local sunshine: ~877 kWh/kWp · +12% vs LL21
LL15 (Denbighshire)
≈15.5 km away
Local sunshine: ~885 kWh/kWp · +13% vs LL21
LL23 (Gwynedd)
≈16.4 km away
Local sunshine: ~860 kWh/kWp · +10% vs LL21
LL14 (Wrexham)
≈22.2 km away
Local sunshine: ~935 kWh/kWp · +19% vs LL21
LL16 (Denbighshire)
≈22.5 km away
Local sunshine: ~924 kWh/kWp · +18% vs LL21
LL11 (Wrexham)
≈26.0 km away
Local sunshine: ~939 kWh/kWp · +20% vs LL21

Similar sunshine across the UK

PA30 (Argyll and Bute)
~785 kWh/kWp · +0% vs LL21
IV49 (Highland)
~786 kWh/kWp · +0% vs LL21
CA8 (Cumberland)
~786 kWh/kWp · +0% vs LL21